switches thread cache to threadline cache
Merge branch 'release/4.1.0' into develop
ignore users #276
cache prefix not set for default cache #278
ignore whole thread if thread-starter is ignored
closes i10n in contacts/<*> headers #277
adds missing backlinks in contact forms
always output ignore help button on users/view
bumps version string
adds ingore_count
omits time wrapper in thread-lines for better performance
adds ignore_counter to fixture
Revert "omits time wrapper in thread-lines for better performance"

This reverts commit 3666e6144026e354c5073e4a2db296416ad2014c.
Merge branch 'release/4.2.0'